Automatic brake.



PATENTED APR. 30, 1907.

J. J. MULLER.

AUTOMATIC BRAKE.

APPLICATION FILED SEPT. 22, 1906.

No. 85l,766.

m'ihesses fig J/BMQM' 1n: Noam: PETERS Co. wAsulNcTaN, n. c.-

tion roller g, which runs on the surface 7.

UNITED STATES PATENT OFFICE.

JOHAN N JAKOB MULLER, OF ZURICH, S'WITZERLAN D, ASSIGN OR TO HENRY BAER AND COMPANY, OF ZURICH, SWITZERLAND.

AUTOMATIC BRAKE.

Specification of Letters Patent.

Application filed September 22, 1906. Serial No. 335,792.

No. 851,766. Patented April 30. 1907.

T0 ctZZ whom it may concern: I

Be it known that I, JOHANN JAKOB MUL- LER, a citizen of Switzerland, residing at Zurich, Switzerland, have invented new and useful Improvements in Automatic Brakes, of which the following is a specification.

My invention relates to an improved construction of automatic brake having two jaws pivotally connected together and adapted to clamp the object to be braked in rider fashion, one of the said jaws carrying a lever which by means of a link has its long arm connected to the short arm of another lever carried by the same jaw. From the free end of the long arm of the first named lever is suspended by means of a rope or its equivalent a weight connected to the long arm of the second named lever, while the short arm of the first named lever has an inclined surface adapted to operate against an adjustable abutment piece carried by the other of the said aws. lVhen the said aws are displaced around the rotating object to be braked, the action of the said suspended weight is so transmitted upon them at a multiplied ratio that when the brake is taken round by the object the grip of the jaws will be released and when left behind increased so that the tendency of the brake will be to maintain its central position upon the obj ect. By loosening the said adjustable abutment piece the brake can be removed.

I attain this object by the means illustrated in the accompanying drawing which is marked with letters of reference.

In carrying out my invention two jaws a & b are pivotally connected together, a carrying two levers c & d. The long arm of the lever c is connected by a link e to the short arm of the lever d and its short arm has an inclined contact surface f. The jaw 1) car ries an abutment piece 9 rendered adjustable by means of a set screw it carried by the said aw.

The abutment piece 9 carries an anti-fricing,,over the pulley /i'. The aws u, b are furnished with brake blocks in which may be of leather and are adapted to bear tightly against the object it to be braked,

The automatic brake described operates as follows:lVhen the jaws a & b are displaced around the object n, the action of the weight is at such a multiplied ratio transmitted upon the lovers 0 & d and the abutment piece g, that when the object n takes the brake with it in the direction indicated by the arrow, the jaws a & b will release and as soon as the brake is left behind in the opposite direction of the arrow, increase their grip, so that the tendency of the brake is to maintain its central position upon the object.

The automatic brake described can be readily removed by slackening the set screw it.

By adjusting the carrier i and pulley /t' the brake power can be increased or reduced and the brake set to suit large or small diameters at will.

I claim:

1. In an automatic brake, two jaws pivotally connected together to clasp the object to be braked in rider fashion, compound levers carried by the said jaws and a weight suspended from one of the said levers, the said weight together with the said levers causing the said jaws to release their grip when the brake is taken round and to increase it when left behind at a multiplied ratio to retain the brake on the object in its central position, all combined substantially as set forth.

2. in an automatic brake, two jaws iivotally connected. together to clasp the object to be braked in rider fashion, two levers carried by one of the said jaws, a link connecting the said levers together, a weight suspended. from the outer and an incline at the inner end of the upper of the said levers and an adjustable abutment piece carried by the other of the said jaws to bear against the said in cline and permit of removing the brake, all comlnned substantiall y as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

J OIIAN N JAKOB MULLER.

Vitnessesr CARL MI'JLLER, A. IJIEBERKNEOIIT The long arm of the lever d is provided with a carrier "L rendered adjustable by means of a set screw. On. this carrier is mounted in a slot 0 a laterally adjustable pulley 7t and to the long arm of the lever c is secured a rope p having at its free end a weight Z and pass 

